Metallosupramolecular Ni2L3 and Ni4L6 complexes of bis-bidentate pyridine-containing ligands: X-ray structures and catalytic proton reduction.

The pyridine-containing ligands and react with Ni(2+) ions to afford dinuclear triple-stranded helicate and tetrahedral cage supramolecular complexes, respectively; the two architectures exhibit contrasting reactivity towards electro- and photocatalytic proton reduction.